I am trying to understand your thinking. If this is Bellardia, shouldn't this one be so also?



And if that is so, where does it leave this one (your image), which you call Calliphora, and where the bend in M seems no different?

The lower calypter on your fly is whitish, while it should be brown on all Calliphora that occur in Massachusetts. Additionally, I think your fly only shows two postsutural intra-alae setae (livida is unique among eastern Calliphora in showing three pairs). The pruinosity on the thorax of my fly is noticeable, while the thorax of this fly appears blackish, with weird whitish blotches.

Again, it's tough to tell for sure from just these photos. If you still have these specimens, could you try for more shots?

Did not get a good dorsal, but here's another showing two interalar setae and light brown calypters.

Evidently I have been photoing a calliphorid that looks somewhat like C. livida but differs in that metallic abdomen is greenish or greenish-gold rather than blue and has calypters pale brown rather than dark grayish brown.

Yeah, these do clinch that it is not livida, which has dark brown lower calypters. I'll upload some more livida photos for comparison. These two appear to be Bellardia, but in fact you do have a good livida as well. I think these might be B. bayeri based on the dark markings on the parafacial, and the tan calypter. Maybe John Carr can take a look.

Am thinking they are pretty clearly bayeri rather than vulgaris because of the features you mention, cited in Whitworth's 2006 key